I booked a Mercedes, but it wasn't available when I got there. Had a minor scrape during the rental, called but no one answered. Returned the car at the parking lot, no one was there to inspect. There were some Eastern European staff wandering around, but the clerk told me they couldn't check the car immediately and that I need to wait for a damage report. Still hasn't come, and two days after return they charged me over 800 euros, plus they didn't refund the 90-euro deposit. I only used my credit card when picking up, but somehow Avis was still able to make withdrawals after I returned the car, which feels very unsafe!